BURLINGTON TWP. – Police searching for missing 18-year-old Florence resident Sarah Townsend say today they’ve found no signs of foul play and worry the girl could have been considering taking her own life when she disappeared.

Townsend has been missing since Monday morning, when her car was found abandoned in a Burlington County park by her boyfriend. The girl’s cell phone and personal belongings were inside. Extensive searches of the park, nearby Sherman’s Pond and marshy areas have not revealed any signs of what could have happened to Townsend.

Corter would not comment on whether police had found a suicide note. Her parents have offered a $10,000 reward for her safe return and thousands of people have joined Facebook pages dedicated to finding Townsend.

Township police are investigating the disappearance alongside the Burlington County Prosecutor’s Office, New Jersey State Police missing persons bureau, and Florence Police, Corter said. Late today, an FBI spokesman confirmed the agency was assisting in the case.

Townsend was last seen leaving for classes at Allentown High School around 7 a.m. Monday. Her boyfriend spoke to her several times on the phone between 7 and when he came across her car near Sherman’s Pond shortly before 10 a.m., Corter said.

Nothing seemed amiss during the conversations, and Townsend’s boyfriend called police minutes after he found her car.

“I can tell you this, the boyfriend has been fully cooperative,” Corter said.

There were no obvious signs that anyone had entered or left the park area around the time Townsend was there, Corter said.